第九天

package ObjectDemo;

import java.util.Objects;

public class Application {

public static void main(String[] args) {
    Demo01 demo01 = new Demo01(10, "张三");
    Demo01 demo02 = new Demo01(20, "李四");
    Demo01 demo04 = new Demo01(20, "李四");

    //判断demo1 和 demo2 是不是一个类型 ,get.Class方法
    Class class1 = demo01.getClass();
    Class class2 = demo02.getClass();
    if (class1 == class2) {
        System.out.println("是一个类");
    } else {
        System.out.println("不是一个类");
    }
    System.out.println("=========================");

    //判断内存是否相等，hashCode
    System.out.println(demo01.hashCode());
    System.out.println(demo02.hashCode());
    Demo01 demo03 = demo01;
    System.out.println(demo03.hashCode());
    System.out.println("==========================");


    //tostring方法,可以在子类重写。因为不满足需求
    System.out.println(demo01.toString());
    System.out.println(demo02.toString());
    System.out.println(demo03.toString());
    System.out.println("==========================");

    //equals,判断两个对象是否相等.不滿足需求重寫
    System.out.println(demo01.equals(demo02));
    System.out.println(demo03.equals(demo01));
    System.out.println(demo02.equals(demo04));
    System.out.println("==========================");

     //回收没用的垃圾
    new Demo01(10, "张三");
    new Demo01(20, "李四");
    new Demo01(20, "王五");
    System.gc();

}

}